[PATCH 1/5] vkd3d-shader/hlsl: Reuse the "init" instruction list if possible in create_loop().

[Zebediah Figura]

From: Zebediah Figura

---
 libs/vkd3d-shader/hlsl.y | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index b9e03325..ea87263d 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -442,18 +442,14 @@ enum loop_type
 static struct list *create_loop(struct hlsl_ctx *ctx, enum loop_type type, struct list *init, struct list *cond,
         struct list *iter, struct list *body, const struct vkd3d_shader_location *loc)
 {
-    struct list *list = NULL;
     struct hlsl_ir_loop *loop = NULL;

-    if (!(list = make_empty_list(ctx)))
+    if (!init && !(init = make_empty_list(ctx)))
         goto oom;

-    if (init)
-        list_move_head(list, init);
-
     if (!(loop = hlsl_new_loop(ctx, loc)))
         goto oom;
-    list_add_tail(list, &loop->node.entry);
+    list_add_tail(init, &loop->node.entry);

if (!append_conditional_break(ctx, cond))
         goto oom;
@@ -469,14 +465,12 @@ static struct list *create_loop(struct hlsl_ctx *ctx, enum loop_type type, struc
     if (type == LOOP_DO_WHILE)
         list_move_tail(&loop->body.instrs, cond);

-    vkd3d_free(init);
     vkd3d_free(cond);
     vkd3d_free(body);
-    return list;
+    return init;

oom:
     vkd3d_free(loop);
-    vkd3d_free(list);
     destroy_instr_list(init);
     destroy_instr_list(cond);
     destroy_instr_list(iter);